【題目】He kept on working out the problem.(改為否定句)

He __________ __________ on working out the problem.

【答案】didn’t keep

【解析】

分析原句可知原句是一般過去時(shí)肯定句,改為否定句時(shí)由助動(dòng)詞didn’t加動(dòng)詞原形構(gòu)成,故填didn’t keep。

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